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Related Experiment Videos

Crack driving force in twisted plywood structures.

F D Fischer1, O Kolednik2, J Predan3

  • 1Institute of Mechanics, Montanuniversität Leoben, Leoben, Austria.

Acta Biomaterialia
|April 12, 2017
PubMed
Summary

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Twisted plywood structures, found in nature, exhibit high fracture toughness. Analyzing fiber rotation reveals crack driving force variations, crucial for understanding material strength and simplifying models.

Area of Science:

  • Materials Science
  • Mechanics of Materials
  • Biomimetics

Background:

  • Twisted plywood architectures are prevalent in natural materials like arthropod cuticles and lamellar bone, contributing to their high fracture toughness.
  • These structures feature complex fiber arrangements, leading to anisotropic material behavior.

Purpose of the Study:

  • To analyze how progressive rotation of fiber direction influences the spatial variation of crack driving force in plywood-like structures.
  • To quantitatively assess the crack driving force in these biomaterials for the first time.

Main Methods:

  • Utilizing the theory of fiber composites to derive the stiffness matrix for twisted plywood structures.
  • Employing computational mechanics coupled with the concept of configurational forces to study crack driving force.
Keywords:
Configurational forcesFiber compositeFracture toughnessLamellar boneStiffness matrix

Related Experiment Videos

  • Introducing configurational forces to model biological materials with inhomogeneous and anisotropic properties.

    • Main Results:

    • Identified a spatial variation in crack driving force, with local minima that enhance the material's fracture toughness.
    • Demonstrated that complex anisotropic structures can be approximated by simpler inhomogeneous isotropic materials for crack driving force calculations.
    • Showcased the applicability of these concepts using lamellar bone as a practical example.

    Conclusions:

    • The spatial distribution and local minima of crack driving force are critical for understanding the fracture properties of twisted plywood structures.
    • Approximating anisotropic twisted plywood with an inhomogeneous isotropic material simplifies the estimation of crack driving force.
    • This research provides novel insights into the mechanics of natural composites and offers simplified modeling approaches.